<template>
  <div class="time" lazy>
    <div class="FlipClock">
      <Flipper ref="flipperHour1" />
      <Flipper ref="flipperHour2" />
      <em>:</em>
      <Flipper ref="flipperMinute1" />
      <Flipper ref="flipperMinute2" />
      <em>:</em>
      <Flipper ref="flipperSecond1" />
      <Flipper ref="flipperSecond2" />
      <p class="page-container">
        既然选择了远航<br />
        便只顾风雨兼程
        <br />
        <router-link to="/">返回首页 </router-link>
      </p>
    </div>
  </div>
</template>

<style >
.page-container {
  font-size: 25px;
  text-align: center;
  color: rgb(192, 204, 218);
}
.router-link-active {
  font-size: 16px;
  color: black;
}
.time {
  height: 100vh;
  display: grid;  
  align-items: center;
  background-image: url(https://api.aoufil.com/img/icon/1625194662375.png);
}
</style>
<style>
.FlipClock {
  text-align: center;
}
.FlipClock .M-Flipper {
  margin: 0 3px;
}
.FlipClock em {
  display: inline-block;
  line-height: 102px;
  font-size: 66px;
  font-style: normal;
  vertical-align: top;
}
</style>
 
<script>
import Flipper from "@/components/Flipper";
export default {
  name: "FlipClock",
  data() {
    return {
      timer: null,
      flipObjs: [],
    };
  },
  components: {
    Flipper,
  },
  methods: {
    // 初始化数字
    init() {
      let now = new Date();
      let nowTimeStr = this.formatDate(new Date(now.getTime()), "hhiiss");
      for (let i = 0; i < this.flipObjs.length; i++) {
        this.flipObjs[i].setFront(nowTimeStr[i]);
      }
    },
    // 开始计时
    run() {
      this.timer = setInterval(() => {
        // 获取当前时间
        let now = new Date();
        let nowTimeStr = this.formatDate(
          new Date(now.getTime() - 1000),
          "hhiiss"
        );
        let nextTimeStr = this.formatDate(now, "hhiiss");
        for (let i = 0; i < this.flipObjs.length; i++) {
          if (nowTimeStr[i] === nextTimeStr[i]) {
            continue;
          }
          this.flipObjs[i].flipDown(nowTimeStr[i], nextTimeStr[i]);
        }
      }, 1000);
    },
    // 正则格式化日期
    formatDate(date, dateFormat) {
      /* 单独格式化年份，根据y的字符数量输出年份
     * 例如：yyyy => 2019
            yy => 19
            y => 9
     */
      if (/(y+)/.test(dateFormat)) {
        dateFormat = dateFormat.replace(
          RegExp.$1,
          (date.getFullYear() + "").substr(4 - RegExp.$1.length)
        );
      }
      // 格式化月、日、时、分、秒
      let o = {
        "m+": date.getMonth() + 1,
        "d+": date.getDate(),
        "h+": date.getHours(),
        "i+": date.getMinutes(),
        "s+": date.getSeconds(),
      };
      for (let k in o) {
        if (new RegExp(`(${k})`).test(dateFormat)) {
          // 取出对应的值
          let str = o[k] + "";
          /* 根据设置的格式，输出对应的字符
           * 例如: 早上8时，hh => 08，h => 8
           * 但是，当数字>=10时，无论格式为一位还是多位，不做截取，这是与年份格式化不一致的地方
           * 例如: 下午15时，hh => 15, h => 15
           */
          dateFormat = dateFormat.replace(
            RegExp.$1,
            RegExp.$1.length === 1 ? str : this.padLeftZero(str)
          );
        }
      }
      return dateFormat;
    },
    // 日期时间补零
    padLeftZero(str) {
      return ("00" + str).substr(str.length);
    },
  },
  mounted() {
    this.flipObjs = [
      this.$refs.flipperHour1,
      this.$refs.flipperHour2,
      this.$refs.flipperMinute1,
      this.$refs.flipperMinute2,
      this.$refs.flipperSecond1,
      this.$refs.flipperSecond2,
    ];
    this.init();
    this.run();
  },
  beforeRouteLeave(to, from, next) {
    // 路由跳转前，清除轮询
    if (window.timer) {
      clearInterval(window.timer);
    }
    next();
  },
};
</script>